New cop for surrounding multiline code blocks by empty lines

[fatkodima]

# bad

def foo
  x = 1
  y = 1
  if bar
    zoo
    quux
  end
  false
end

# good

def foo
  x = 1
  y = 1

  if bar # <--- multiline, should be separated by a blank line from its neighbors
    zoo
    quux
  end

  false
end

These extra spaces adds breathing room and makes code easier to read.
I am going to implement this in my app as a custom cop. If this is welcome in core, let me know.

[koic]

Whether it will be accepted in RuboCop likely depends on the discussion in the style guide. This will be transferred over there.

[pirj]

We have a

to break up methods into logical paragraphs internally.

guideline already.

To me, it boils down to figuring out if the multiline “if” should be logically separated or not, which is barely possible with our tools.